X-Message-Number: 16797
From: "Trygve Bauge" <>
Subject: Dewars and electrical freezers
Date: Mon, 2 Jul 2001 02:06:08 +0200

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>>Trygve said:

>> Or having someone in Europe build a smaller 1 or 2 person dewar, as
>> suggested by
>> D. den Otter.

>D. den Otter responded:

>Actually, that's not quite what I suggested. I've attached (parts of)
>the relevant posts below.

Trygves response: What I refered to was the following paragraph in a letter from
den Otter:

>I think that electric cryogenic freezers (see previous
>post) or locally bought smaller dewars would be a
>better idea. The boiloff in smaller dewars can be
>somewhat compensated with better insulation and by
>using a closed system, where LN2 is automatically
>added from the supply tank(s) to the storage unit by
>means of a simple lever system. Such systems can be
>either bought off-the-shelf, or could be designed by
>some people I know. It's safer, too.

I know that den Otter prefers electrical freezers for storage of heads,

but in my post I was refering to what he wrote about smaller dewars, still large
enough to store whole bodies in. (Or at least that is what I understood these 
to be.)


Trygve Bauge

Ps. As to head storage in electrical freezers. Anyone that has seen an 
electrical home food freezer thaw out due to electrical failure or a brown or 
black out, will likely tend to feel safer about a huge liquid nitrogen tank that
don't need electricity and don't have to be refilled for several weeks.  There 
are fewer mobile parts in a cryotank, than in any electrical freezer,

and the backup systems are simpler: e.g. another dewar, while an electrical 
freezer is dependent upon a backup generator and a backup supply of LN2 or dry 

And as to the dewar being damaged in transit. One can buy insurance that covers 
any damage that occurs in transit.


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